This is an e-book by www.toc-goldratt.com web site.
U Shape is very concise coverage of TOC philosophy with a practical how-to guide.
Logical tools have been presented with their relationships.
MTO and MTA modes of production implementation plans have been presented in a progressive way with important reminders and precautions.
Althoug the book is long (over 500 pages) it is easy to read and follow.